#include<stdio.h>

char get_choice(void);
char get_first(void);
int get_int(void);
void count(void);


int main(void) {
	int choice;
	void count(void);

	while ( (choice = get_choice()) != 'q') {
		switch (choice) {
			case 'a' : printf("Buy low, sell high.\n");
					   break;
			case 'b' : putchar('\a');
					   break;
			case 'c' : count();
					   break;
			default : printf("Program error.\n");
					   break;
		}
	}
	printf("Bye.\n");

    return 0;
}


void count(void) {
	int n,i;
	printf("Count how far? Enter an integer: \n");
	n = get_int();
}


char get_choice(void) {
	char ch;

	printf("Enter the letter of your choice:\n");
	printf("a. advice			b. bell\n");
	printf("c. count			q. quit\n");
	ch = getchar();
	ch = get_first();
	while ( (ch < 'a' || ch > 'c') && ch != 'q') {
		printf("Please respond with a, b, c, or q.\n");
		ch = get_first();
	}

	return ch;
}

char get_first(void) {
	char ch;
	ch = getchar();
	while (getchar() != '\n')
		continue;
	return ch;
}

int get_int(void) {
	int input;
	char ch;
	while (scanf("%d", &input) != 1) {
		while ((ch = getchar() != '\n'))
				putchar(ch); // dispose of bad input

		printf(" is not  an integer.\nPlease enter an ");
		printf("integer value, such as 25, -178, or 3: ");
	}
	return input;
}
